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Sreedhar Bojja (2017) Synthesis, characterization and visible light photocatalytic activity of Mg 2+ and Zr 4+ co-doped TiO 2 nanomaterial for degradation of methylene blue,

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The present investigation summarizes the synthesis and characterization of zinc and boron co-doped TiO 2 nano catalyst by sol gel method at relatively low temperature and explored the optimum reaction parameters for the degradation of Acid Red 6A (AR 6A) under visible light irradiation. The structural, morphological, surface properties of the synthesized photocatalysts were characterized by X-Ray Diffraction, Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy, Transmission Electron Microscopy, Brunauer-Emmett-Teller, UV-Vis-Diffuse Reflectance Spectroscopy, X-ray Photo Electron Spectroscopy and Fourier Transform-Infra Red Spectroscopy. The findings of the characterization results revealed that Zn 2+ ion was substitutionally doped into TiO 2 lattice by replacing Ti 4+ ion and a part of the boron substituted the oxygen in TiO 2 lattice and the remaining amount was converted to B 2 O 3 due to calcinations at 450°C. The degradation of AR 6A was achieved at optimum reaction parameters, such as pH = 6 with a catalyst dosage 100 mg L −1 for the degradation of 5 mg L −1 of dye solution.

The present work is focused on the synthesis of beryllium doped titania (Be+2–TiO2) at different percentages (0.25, 0.5, 0.75 and 1.0 wt.%) by the sol-gel method and its characterization using X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform-Infra red and Ultra violet-visible absorption spectroscopic methods. Diffraction peaks of anatase crystalline phase were present in both synthesized TiO2 and Be+2–TiO2. The presence of Be+2 ion in the TiO2 structure caused a significant absorption shift towards the visible region and its presence was confirmed by X-ray photoelectron spectroscopy and Fourier Transform-Infra Red data. The photocatalytic efficiency of the synthesized Be+2–TiO2 and pure TiO2 was evaluated by the degradation of aqueous methyl orange dye under visible light irradiation, where the degradation rate of methyl orange by Be+2–TiO2 was found to be higher than by pure TiO2. This can be attributed to more efficient electron–hole creation in Be+2–TiO2 in visible light and the electrons produced due to photosensitization of the dye can be scavenged by photoexcited doped TiO2 in visible light.